The additive calculation method is the way the the Professional Wireless System’s IAS
software works.
This method lets users select specific values for each frequency and decide which
compromises to make. Though more time-consuming, it offers precise control and can
identify more frequencies within a given bandwidth compared to other methods.
To begin with a additive calculation:
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In the Calculation area, select an equipment profile or
create a new one.
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Navigate to Test type.
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Click on Range and then on Calculate.
The calculated frequencies are displayed.

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Add frequencies to your coordination from the Candidates list.
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Repeat for each device you need in your coordination.
This allows selecting specific profile, IMD tests and Band Plans for
each specific frequency that is going to be in the
calculation.
The additive calculation is now complete.